CN109188509B - Detector low-frequency compensation circuit, pre-amplification circuit and detector circuit thereof - Google Patents
Detector low-frequency compensation circuit, pre-amplification circuit and detector circuit thereof Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
- G01V1/18—Receiving elements, e.g. seismometer, geophone or torque detectors, for localised single point measurements
- G01V1/181—Geophones
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
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Abstract
The invention belongs to the field of seismic exploration, and particularly relates to a low-frequency compensation circuit, a pre-amplification circuit and a detector circuit of the low-frequency compensation circuit. According to the invention, the purpose of low-frequency compensation is respectively achieved by utilizing the feedback loop of the amplifier to realize different gains under different frequencies and utilizing the compensation circuit independent of the amplifier to realize different attenuations under different frequencies, namely, insufficient low-frequency information caused by various reasons is compensated, so that the imaging effect and the precision of seismic exploration data are improved, and the depth of an exploration target layer is effectively improved.
Description
Technical Field
The invention relates to the field of seismic exploration, in particular to a low-frequency compensation circuit, a pre-amplification circuit and a detector circuit of the low-frequency compensation circuit.
Background
In a seismic exploration system, a detector is used for converting received stratum vibration waves into electric signals to be output, seismic waves generated by the excitation of a seismic source propagate to the depth of a stratum, reflected waves with stratum information are transmitted to a ground detector for receiving, and the detector completes the electromechanical conversion of vibration energy. The converted electric signals are amplified and arranged and then output to a subsequent acquisition station and a seismometer for storage and analysis. The vibration source excitation generally adopts an explosive or an artificial vibration source vehicle, is limited by physical characteristics and conditions, causes congenital deficiency of a low-frequency part in an excited energy spectrum, and loss of the low-frequency signal in the transmission process of a vibration signal to a stratum, and also causes obvious deficiency of a low-frequency information component relative to an intermediate-frequency component and a high-frequency component in the signal received by a detector and transmitted to the seismometer due to partial attenuation of the low-frequency signal received by the detector, so that the imaging level of the seismic exploration data and the real reflection of the stratum appearance are directly influenced. As the high-frequency information decays faster along with the increase of the transmission depth when the seismic signal is transmitted in the deep stratum, the low-frequency information plays a main role in deep exploration, and therefore the exploration effect of a deep target layer can be influenced by the lack of the low-frequency information.
Specifically, in the prior art, the main component structure of the signal path part of the detector is shown in fig. 2, wherein the core unit is used as a vibration starting unit, sensing principles such as magnetoelectric sensing, piezoelectric sensing, tolerance, grating and the like can be adopted to complete the receiving of vibration signals, the vibration signals are converted into electric signals, the impedance transformation and amplification functions of the preamplifier are completed, and the vibration electric signals output by the core unit are received and amplified in the full frequency domain to obtain full frequency domain signals required by subsequent acquisition and seismic analysis. Because of the frequency spectrum characteristics of the vibration source excitation and the limitation of excitation energy and the attenuation of various substances and mediums of the stratum to various frequency components of the vibration signal, the energy of the signal of the stratum reflected wave reaching the movement is weak, and a pre-amplifying circuit in the signal processing circuit bears the amplifying task of the weak signal, namely a certain circuit gain is provided. However, the circuit-demanding features of the signal processing circuit, in particular the filter circuit provided for suppressing zero drift and disturbances, at the same time form a certain attenuation of the signal frequency components, in particular of the low-frequency information.
The main part principle of the pre-amplifying circuit is shown in figure 3, wherein the core unit can convert vibration signals into electric signals to be input to the input end of the pre-amplifier by adopting sensing principles such as magnetoelectric sensing, piezoelectric sensing, tolerance, grating and the like, the first resistor R1 and the second resistor R2 are input resistor circuits of the pre-amplifier, and provide necessary working conditions for the first operational amplifier A1 and the second operational amplifier A2; the first operational amplifier A1, the second operational amplifier A2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 form an amplifying unit circuit, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are negative feedback loops of the amplifying circuit, and r3=r4 (the following calculation formula ignores R4), and the preamplifier provides a certain amplifying gain to amplify the electric signal converted by the movement unit; gain amplification factor a:
a=1+2r3/R5 equation 1
The first capacitor C1, the second capacitor C2 and the sixth resistor R6 form a balanced high-pass (low-cut) filter circuit, so as to filter out the zero drift direct current component in the signal. Although the cut-off frequency setting is low, it still has some effect on the low-end frequency spectrum of the signal.
If the movement unit adopts piezoelectric sensing, the movement unit has a capacitive characteristic. The capacitive sensing unit forms a high pass (low cut) filter circuit with the input resistor. The first capacitor C1, the second capacitor C2 and the sixth resistor R6 form a second-stage high-pass (low-cut) filter circuit, the two-stage high-pass filter circuit has a certain influence on the low-frequency spectrum characteristic of the whole detector, the spectrum curve of the whole detector is shown in fig. 4, three curves are three detector spectrum curves designed to be different high-pass cut-off frequencies, and the detector itself has a certain attenuation on the acceptance of low-frequency information. If the low-frequency loss of the vibration source excitation and the low-frequency loss of the stratum signal transmission are added, the low-frequency energy of the whole system is greatly influenced.
To obtain the required low frequency components that truly reflect formation information, the attenuation of the low frequency components caused during signal transmission must be compensated to some extent to counteract the attenuation that has already formed and is currently unavoidable. Thus, a low frequency compensation circuit needs to be added to the detector circuit to compensate for the above-described lack of low frequency.
Disclosure of Invention
The invention aims to provide a detector low-frequency compensation circuit which compensates insufficient low-frequency information caused by various reasons, thereby improving the imaging effect and precision of seismic exploration data and effectively improving the depth of an exploration target layer.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a detector low frequency compensation circuit, comprising at least: a resistor and a capacitor, the resistor is connected in series with the capacitor and connected in parallel with the feedback loop of the detector pre-amplifying circuit to be compensated.
The pre-amplifying circuit comprises a first operational amplifier A1, a second operational amplifier A2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5; the first resistor R1 is connected in series with the second resistor R2 and grounded, and is connected to the non-inverting input ends of the first operational amplifier A1 and the second operational amplifier A2; the non-inverting input end of the first operational amplifier A1 and the non-inverting input end of the second operational amplifier A2 are respectively connected with the voltage output end of the movement unit; the inverting input end of the first operational amplifier A1 is connected with one end of a third resistor R3, and the other end of the third resistor R3 is connected with the output end of the first operational amplifier A1; the inverting input end of the second operational amplifier A2 is connected with one end of a fourth resistor R4, and the other end of the fourth resistor R4 is connected with the output end of the second operational amplifier A2; the inverting input end of the first operational amplifier A1 is connected with the inverting input end of the second operational amplifier A2 through a fifth resistor R5; the resistor comprises a seventh resistor R7 and an eighth resistor R8, the capacitor comprises a third capacitor C3 and a fourth capacitor C4, the seventh resistor R7 and the third capacitor C3 are connected in series and then connected with the third resistor R3 in parallel, and the seventh resistor R7 and the third capacitor C3 are connected across the reverse input end and the output end of the first operational amplifier A1; the eighth resistor R8 and the fourth capacitor C4 are connected in series and then connected in parallel with the fourth resistor R4, and are connected across the inverting input end and the output end of the second operational amplifier A2 of the detector.
The third resistor R3 and the fourth resistor R4 are equal, and the third capacitor C3 and the fourth capacitor C4 are equal; the pre-amplifier circuit adopts a fully differential amplifier circuit.
The resistor comprises a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9, and the capacitor is a third capacitor C3; the ninth resistor R9 and the third capacitor C3 are connected in series and then connected with the output ends of the seventh resistor R7 and the eighth resistor R8, and the input ends of the seventh resistor R7 and the eighth resistor R8 are respectively connected with the two output ends of the pre-amplifying circuit.
The seventh resistor R7 and the eighth resistor R8 are equal.
The movement unit adopts the principles of magnetoelectric, piezoelectric sensing, tolerance and grating sensing.
A detector pre-amplifier circuit with a low frequency compensation circuit comprising the low frequency compensation circuit of claim 2 or 3.
A detector pre-amplifier circuit with a low frequency compensation circuit comprising the low frequency compensation circuit of claim 4.
A detector circuit at least comprises a core unit, a preamplifier, a high-pass filter circuit and a subsequent filter and data acquisition circuit; the two output ends of the high-pass filter circuit are respectively connected with the input ends of the subsequent filter and data acquisition circuit, and the detector pre-amplifying circuit with the low-frequency compensation circuit as claimed in claim 6 or 7 is further comprised, the two output ends of the core unit are respectively connected with the input resistance circuit of the pre-amplifier and then are respectively connected with the two non-inverting input ends of the pre-amplifying circuit, and the two output ends of the pre-amplifying circuit are respectively connected with the two input ends of the high-pass filter circuit.
The input resistor circuit of the preamplifier is composed of a first resistor R1 and a second resistor R2, and the first resistor R1 and the second resistor R2 are connected in series and grounded; the high-pass filter circuit is composed of a first capacitor C1, a second capacitor C2 and a sixth resistor R6, wherein the input ends of the first capacitor C1 and the second capacitor C2 are respectively connected with two output ends of the pre-amplifying circuit, and the two ends of the sixth resistor R6 are respectively connected with the output ends of the first capacitor C1 and the second capacitor C2.
The beneficial effects are that: the invention realizes the purpose of low-frequency compensation by using the feedback loop of the amplifier to realize different gains under different frequencies and realizes the purpose of low-frequency compensation by using the compensation circuit independent of the amplifier to realize different attenuations under different frequencies, namely, compensates the insufficient low-frequency information caused by various reasons, thereby improving the imaging effect and the precision of the seismic exploration data and effectively improving the depth of the exploration target layer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the invention in which a low frequency compensation circuit is added to a pre-amplifier circuit;
FIG. 2 is a schematic diagram of the main components of the signal path portion of the detector;
FIG. 3 is a schematic diagram of the main parts of a pre-amplifier circuit;
FIG. 4 is a diagram showing a comparison of detector received signals at different lower frequencies;
FIG. 5 is a graph of gain after compensation by adding a low frequency compensation circuit to the pre-amplifier circuit;
FIG. 6 is a schematic diagram of the spectral characteristics of the circuit before compensation;
FIG. 7 is a schematic diagram of a low frequency compensation circuit added after a pre-amplifier circuit;
FIG. 8 is a graph of gain after compensation by a low frequency compensation circuit added after a pre-amplification circuit;
fig. 9 is a schematic diagram of the overall spectrum of a detector with a low frequency compensation circuit in two ways.
In the figure, R1 is a first resistor; r2-a second resistor; r3-a third resistor; r4-fourth resistor; r5-fifth resistor; r6-sixth resistance; r7-seventh resistor; r8-eighth resistor; r9-ninth resistance; c-1 a first capacitor; c2-a second capacitance; a C3-third capacitor; a1-a first operational amplifier; a2-a second operational amplifier.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
a detector low frequency compensation circuit as shown in fig. 1, comprising at least: a resistor and a capacitor, the resistor is connected in series with the capacitor and connected in parallel with the feedback loop of the detector pre-amplifying circuit to be compensated.
Preferably, the pre-amplifying circuit comprises a first operational amplifier A1, a second operational amplifier A2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5; the first resistor R1 is connected in series with the second resistor R2 and grounded, and is connected to the non-inverting input ends of the first operational amplifier A1 and the second operational amplifier A2; the non-inverting input end of the first operational amplifier A1 and the non-inverting input end of the second operational amplifier A2 are respectively connected with the voltage output end of the movement unit; the inverting input end of the first operational amplifier A1 is connected with one end of a third resistor R3, and the other end of the third resistor R3 is connected with the output end of the first operational amplifier A1; the inverting input end of the second operational amplifier A2 is connected with one end of a fourth resistor R4, and the other end of the fourth resistor R4 is connected with the output end of the second operational amplifier A2; the inverting input end of the first operational amplifier A1 is connected with the inverting input end of the second operational amplifier A2 through a fifth resistor R5; the resistor comprises a seventh resistor R7 and an eighth resistor R8, the capacitor comprises a third capacitor C3 and a fourth capacitor C4, the seventh resistor R7 and the third capacitor C3 are connected in series and then connected with the third resistor R3 in parallel, and the seventh resistor R7 and the third capacitor C3 are connected across the reverse input end and the output end of the first operational amplifier A1; the eighth resistor R8 and the fourth capacitor C4 are connected in series and then connected in parallel with the fourth resistor R4, and are connected across the inverting input end and the output end of the second operational amplifier A2 of the detector.
Preferably, the third resistor R3 and the fourth resistor R4 are equal, and the third capacitor C3 and the fourth capacitor C4 are equal; the pre-amplifier circuit adopts a fully differential amplifier circuit.
In practical use, in order to obtain the required low-frequency component which truly reflects the formation information, attenuation of the low-frequency component caused in the signal transmission process must be compensated to a certain extent so as to offset the attenuation which is formed and is unavoidable at present. In the embodiment, a low-frequency compensation circuit is added in the pre-amplifying circuit, namely, a seventh resistor R7, a third capacitor C3, an eighth resistor R8 and a fourth capacitor C4 are added in a negative feedback loop of the amplifier, and the seventh resistor R7, the third resistor R3 and the fourth resistor R4 form the compensation circuit together.
The movement unit is used for converting vibration signals into electric signals and inputting the electric signals to the pre-amplifier, the electric signals are connected with the non-inverting input ends of the first operational amplifier A1 and the second operational amplifier A2, an input impedance circuit is formed by the first resistor R1 and the second resistor R2, the first resistor R1 and the second resistor R2 are connected with the ground, and the electric signals are respectively connected with the movement output end and the non-inverting input ends of the first operational amplifier A1 and the second operational amplifier A2. The third resistor R3, the seventh resistor R7, the third capacitor C3, the fourth resistor R4, the eighth resistor R8, and the fourth capacitor C4 together with the fifth resistor R5 form an amplifier negative feedback circuit with a low frequency compensation circuit. The seventh resistor R7 and the third capacitor C3 are connected in series and then connected with the third resistor R3 in parallel, and are connected across the inverting input end and the output end of the first operational amplifier A1; the eighth resistor R8 and the fourth capacitor C4 are connected in series and then connected with the fourth resistor R4 in parallel, and are connected across the inverting input end and the output end of the second operational amplifier A2; the fifth resistor R5 is connected to the inverting input terminals of the first operational amplifier A1 and the second operational amplifier A2. The outputs of the first operational amplifier A1 and the second operational amplifier A2 are connected to a high-pass filter composed of a first capacitor C1, a second capacitor C2 and a sixth resistor R6, respectively. The filter outputs to subsequent other filtering circuits and data acquisition circuits.
The seventh resistor R7, the third capacitor C3, the third resistor R3, the eighth resistor R8, the fourth capacitor C4, the fourth resistor R4 and the fifth resistor R5 form a gain circuit with low-pass amplification, since the capacitance resistance value of the capacitor changes with the frequency, the reactance of the feedback loop part changes with the frequency, the gain changes with different frequencies according to the gain calculation formula 1, and the compensated gain curve is as shown in fig. 5: the abscissa is the frequency f and the ordinate is the voltage V
The circuit itself causes a partial low frequency loss due to the existence of the first capacitor C1, the second capacitor C2 and the sixth resistor R6 analog high-pass filter circuit and the influence of the capacitive movement, and the circuit spectrum characteristic is shown in fig. 6.
f1 and f2 are enhancement parts, i.e. compensation parts that we need. And is a 0dB based compensation.
By adjusting the values of the third resistor R3, the seventh resistor R7, the third capacitor C3, the fourth resistor R4, the eighth resistor R8 and the fourth capacitor C4, the compensation of different frequency bands and the compensation strength required correspondingly can be set. By adjusting the value of the fifth resistor R5, the gain amplification of the entire circuit can be adjusted.
All resistors in the circuit can be carbon film resistors with 0.1% precision, the capacitors can be X7R material capacitors, and the operational amplifier can be OPA333. The movement unit can adopt sensing principles such as magneto-electricity, piezoelectric sensing, tolerance, grating and the like.
This way the low frequency compensation is achieved by different gains at different frequencies.
In practical use, the amplifier may be other types of amplifying circuits, such as inverting or non-inverting input amplifier, differential or non-differential amplifier, and the compensating circuit may be added by a negative feedback loop to change the gain at different frequencies to realize low-frequency compensation. The low frequency compensation circuit may be a balanced (symmetrical) circuit or an unbalanced (asymmetrical) circuit.
Example two
A low frequency compensation circuit of a detector as shown in fig. 7 is different from the first embodiment in that: the resistor comprises a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9, and the capacitor is a third capacitor C3; the ninth resistor R9 and the third capacitor C3 are connected in series and then connected with the output ends of the seventh resistor R7 and the eighth resistor R8, and the input ends of the seventh resistor R7 and the eighth resistor R8 are respectively connected with the two output ends of the pre-amplifying circuit.
It is preferable that the seventh resistor R7 and the eighth resistor R8 are equal.
In practical use, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a third capacitor C3 are added in the circuit after differential output of the preamplifier, and the seventh resistor R7, the eighth resistor R8, the ninth resistor R9 and the third capacitor C3 form a first-order low-pass filter circuit, so that the circuit becomes a needed low-frequency compensation circuit.
The movement unit converts the vibration signal into an electric signal and inputs the electric signal to the non-inverting input ends of the first operational amplifier A1 and the second operational amplifier A2. The first resistor R1 and the second resistor R2 form an input impedance circuit, the first resistor R1 and the second resistor R2 are connected in series and grounded, and the first resistor R1 and the second resistor R2 are respectively connected with the output end of the movement and the input non-phase ends of the first operational amplifier A1 and the second operational amplifier A2. The third resistor R3, the fourth resistor R4 and the fifth resistor R5 constitute an amplifier negative feedback circuit. The output signals of the first operational amplifier A1 and the second operational amplifier A2 are output to a low-frequency compensation circuit formed by a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a third capacitor C3, and the ninth resistor R9 and the third capacitor C3 are connected in series and then connected with the seventh resistor R7 and the eighth resistor R8. The compensation circuit outputs to a high-pass filter circuit composed of a first capacitor C1, a second capacitor C2 and a sixth resistor R6 so as to filter out zero DC drift components. And after the high-pass filter circuit, other filter circuits and a subsequent data acquisition circuit are connected.
In the compensation circuit formed by the low-pass filter circuit formed by the seventh resistor R7, the eighth resistor R8, the ninth resistor R9 and the third capacitor C3, the capacitance resistance of the capacitor C3 changes along with the frequency of the signal, so that the reactance of the ninth resistor R9 and the third capacitor C3 after being connected in series also changes along with the frequency, and the low-pass filter parameters formed by the seventh resistor R7 and the eighth resistor R8 also change along with the frequency. Different attenuations of the signal at different frequencies are achieved. The attenuation is not zeroed due to the presence of the ninth resistor R9 to ensure acceptance and transmission of uncompensated high frequency information, as shown in fig. 8. The spectral characteristics from fig. 8 are similar to those of fig. 5, that is, the effect of the low frequency compensation shown in the first embodiment is fully achieved.
The first capacitor C1, the second capacitor C2 and the sixth resistor R6 simulate the existence of a high-pass filter circuit and the influence of a capacitive movement, so that the circuit self causes the loss of partial low frequency, and the frequency spectrum characteristics of the circuit are the same as those of fig. 6; as shown in fig. 6, f1 and f2 are enhancement parts, that is, compensation parts that we need. By adjusting the values of the seventh resistor R7, the eighth resistor R8, the ninth resistor R9 and the third capacitor C3, the compensation of different frequency bands and the corresponding required compensation intensity can be set. By adjusting the value of the fifth resistor R5, the gain amplification of the entire circuit can be adjusted.
In practical use, the amplifier may be other types of amplifying circuits, such as an inverting or non-inverting input amplifier, and a differential or non-differential amplifier, and the compensating circuit may be also arranged independently of the amplifiers, so as to change attenuation at different frequencies to realize low-frequency compensation. The low frequency compensation circuit may be a balanced (symmetrical) circuit or an unbalanced (asymmetrical) circuit.
The two low-frequency compensation circuits in the first embodiment and the second embodiment are shown in fig. 9, and the frequency spectrum of the whole detector added with the low-frequency compensation circuit is shown in fig. 9, so that the f1-f2 frequency band is compensated in fig. 9, and the purpose of low-frequency compensation of the detector is realized.
Example III
A detector circuit at least comprises a core unit, a preamplifier, a high-pass filter circuit and a subsequent filter and data acquisition circuit; the two output ends of the high-pass filter circuit are respectively connected with the input ends of the follow-up filter and data acquisition circuit, and the high-pass filter circuit further comprises a detector pre-amplifying circuit with a low-frequency compensation circuit, wherein the two output ends of the core unit are respectively connected with the input resistance circuit of the pre-amplifying circuit and then are connected with the two in-phase input ends of the pre-amplifying circuit, and the two output ends of the pre-amplifying circuit are respectively connected with the two input ends of the high-pass filter circuit.
Preferably, the input resistor circuit of the preamplifier is composed of a first resistor R1 and a second resistor R2, and the first resistor R1 and the second resistor R2 are connected in series and grounded; the high-pass filter circuit is composed of a first capacitor C1, a second capacitor C2 and a sixth resistor R6, wherein the input ends of the first capacitor C1 and the second capacitor C2 are respectively connected with two output ends of the pre-amplifying circuit, and the two ends of the sixth resistor R6 are respectively connected with the output ends of the first capacitor C1 and the second capacitor C2.
When in actual use, the detector pre-amplifying circuit with the low-frequency compensation circuit is utilized to compensate insufficient low-frequency information caused by various reasons, thereby improving the imaging effect and the precision of the seismic exploration data and effectively improving the depth of the exploration target layer.
In summary, the invention achieves the purpose of low-frequency compensation by using the feedback loop of the amplifier to realize different gains under different frequencies and achieves the purpose of low-frequency compensation by using the compensation circuit independent of the amplifier to realize different attenuations under different frequencies, namely, compensates insufficient low-frequency information caused by various reasons, thereby improving the imaging effect and the precision of the seismic exploration data and effectively improving the depth of the exploration target layer.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
The technical solutions between the embodiments may be combined with each other, but it is necessary to base the implementation on the basis of those skilled in the art that when the combination of technical solutions contradicts or cannot be implemented, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.
Claims (7)
1. A detector low frequency compensation circuit, comprising at least: a resistor and a capacitor, the resistor is connected in series with the capacitor and connected in parallel with the feedback loop of the detector pre-amplifying circuit to be compensated;
the pre-amplifying circuit comprises a first operational amplifier A1, a second operational amplifier A2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5; the first resistor R1 is connected in series with the second resistor R2 and grounded, the non-inverting input ends of the first operational amplifier A1 and the second operational amplifier A2 are connected; the non-inverting input end of the first operational amplifier A1 and the non-inverting input end of the second operational amplifier A2 are respectively connected with the voltage output end of the movement unit; the inverting input end of the first operational amplifier A1 is connected with one end of a third resistor R3, and the other end of the third resistor R3 is connected with the output end of the first operational amplifier A1; the inverting input end of the second operational amplifier A2 is connected with one end of a fourth resistor R4, and the other end of the fourth resistor R4 is connected with the output end of the second operational amplifier A2; the inverting input end of the first operational amplifier A1 is connected with the inverting input end of the second operational amplifier A2 through a fifth resistor R5; the resistor comprises a seventh resistor R7 and an eighth resistor R8, the capacitor comprises a third capacitor C3 and a fourth capacitor C4, the seventh resistor R7 and the third capacitor C3 are connected in series and then connected with the third resistor R3 in parallel, and the seventh resistor R7 and the third capacitor C3 are connected across the inverting input end and the output end of the first operational amplifier A1; the eighth resistor R8 and the fourth capacitor C4 are connected in series and then connected with the fourth resistor R4 in parallel, and are connected across the inverting input end and the output end of the second operational amplifier A2 of the detector;
the resistor comprises a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9, and the capacitor is a third capacitor C3; the ninth resistor R9 and the third capacitor C3 are connected in series and then connected with the output ends of the seventh resistor R7 and the eighth resistor R8, and the input ends of the seventh resistor R7 and the eighth resistor R8 are respectively connected with the two output ends of the pre-amplifying circuit.
2. A detector low frequency compensation circuit as claimed in claim 1, wherein: the third resistor R3 and the fourth resistor R4 are equal, and the third capacitor C3 and the fourth capacitor C4 are equal; the pre-amplifier circuit adopts a fully differential amplifier circuit.
3. The detector low frequency compensation circuit of claim 1, wherein the seventh resistor R7 and the eighth resistor R8 are equal.
4. A detector low frequency compensation circuit as claimed in claim 1, wherein: the movement unit adopts the principles of magnetoelectric, piezoelectric sensing, tolerance and grating sensing.
5. A detector pre-amplifier circuit with a low frequency compensation circuit, characterized by: comprising the low frequency compensation circuit of claim 1.
6. A detector circuit at least comprises a core unit, a preamplifier, a high-pass filter circuit and a subsequent filter and data acquisition circuit; two output ends of the high-pass filter circuit are respectively connected with the input ends of the follow-up filter and data acquisition circuit, and the high-pass filter circuit is characterized in that: the detector pre-amplifier circuit with the low-frequency compensation circuit as claimed in claim 5 further comprises two output ends of the core unit, which are respectively connected with the input resistor circuit of the pre-amplifier and then are respectively connected with two non-inverting input ends of the pre-amplifier, and the two output ends of the pre-amplifier are respectively connected with two input ends of the high-pass filter circuit.
7. A detector circuit as claimed in claim 6, wherein: the input resistor circuit of the preamplifier is composed of a first resistor R1 and a second resistor R2, and the first resistor R1 and the second resistor R2 are connected in series and grounded; the high-pass filter circuit is composed of a first capacitor C1, a second capacitor C2 and a sixth resistor R6, wherein the input ends of the first capacitor C1 and the second capacitor C2 are respectively connected with two output ends of the pre-amplifying circuit, and the two ends of the sixth resistor R6 are respectively connected with the output ends of the first capacitor C1 and the second capacitor C2; and the first capacitance C1 and the second capacitance C2 are equal.
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| CN201811106468.3A CN109188509B (en) | 2018-09-21 | 2018-09-21 | Detector low-frequency compensation circuit, pre-amplification circuit and detector circuit thereof |
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| JPH0581670U (en) * | 1992-04-13 | 1993-11-05 | オプテックス株式会社 | Infrared detector |
| WO2008106822A1 (en) * | 2007-03-06 | 2008-09-12 | Zongshan Zhou | Method for resistance combining double sampling loop negative feedback and amplifier thereof |
| JP2011247847A (en) * | 2010-05-31 | 2011-12-08 | Onkyo Corp | Displacement detection device and pre-amplifier |
| CN104783781A (en) * | 2015-04-13 | 2015-07-22 | 深圳市飞马与星月科技研究有限公司 | Low-distortion electrocardiosignal collecting and processing circuit and electrocardio collecting device |
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| JPH0581670U (en) * | 1992-04-13 | 1993-11-05 | オプテックス株式会社 | Infrared detector |
| WO2008106822A1 (en) * | 2007-03-06 | 2008-09-12 | Zongshan Zhou | Method for resistance combining double sampling loop negative feedback and amplifier thereof |
| JP2011247847A (en) * | 2010-05-31 | 2011-12-08 | Onkyo Corp | Displacement detection device and pre-amplifier |
| CN104783781A (en) * | 2015-04-13 | 2015-07-22 | 深圳市飞马与星月科技研究有限公司 | Low-distortion electrocardiosignal collecting and processing circuit and electrocardio collecting device |
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